Governed pump.



N. MOCARTY.

GOVERNED PUMP.

APPLICATION nun) A1104), 1909 943,095, Patented Dec. 14, 1909.

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UNITED STATES PATENT OFFICE.

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Specification of Letters Patent.

Patented Dec. 14, 1909.

Application filed August 9, 1909. Serial N0. 511,985.

COMM.

Be It known that I, Norman MCCARTY,

The object of my invention is to produce 5 a' 'm ca bio of deliveringvariabl measur d qhaniii ies of a fluid, and of suc charactor that nomaterial pressure will be exerted upon the mechanism by means of whichthe amount of delivery is varied, thus making a pump which is especiallyadapted for use in delivering successively measured, variable quantitiesof liquid fuel to on inte'rnalcombnstion en of the non-explosive'ty' theadjusting mechanism of the pump mg connected with a speed controlledgovernor driven by the motor.

The accompanying drawing, which is a vertical section, illustrates anembodiment of my'invention.

In the drawing, 10 indicates a suitable bbdy havmg' a pump chamber 11orme'd therein. Projected into chamber 11, through a suitable packinggland 12, is a displacing plunger 13 which may conven- Ien y have auniform stroke produced in andesired manner, as, for lnstance, by meansof the arm 14 carried by stra 15 surrounding an eccentric 16 carried yshaft I7: Leading into chamber 11 is a su ply pipe 18 in which isarranged the usual inwardjy opening check valve 19, and leading fromchamber 11 is a discharge pi e 21 in which is mounted the usual outwarly openin' check valve 22. Also pro'ccted mto ch ber 11, through a.suitable packing "land 23, is a compensating plunger 24.

ung'er 24 at its outer end, 13 formed into a plunger 25 which passesthrough a suitable 'acking land 26 Into a ressure chamber 7 into w ichis introduce through a suitable ipe 28, a ielding fluid pressure ofstifliclent amoun to propel plunger 24 throu h the packing ofidglnnd 23when pluu gar 1 is being retract u Plunger 24 in its outward stroke,needs to be definitely and uniform] limited, and any: desirable slop runbe m opted for this pa pose. Probably he most convenient entlstructionhowever is to provide a shoulder 8'! in chamber 27 against which the endI caused to engage stop 35,

with a roller 34 ada ted to cage of plunger 25 will be driven and thuslimit the outward movement of plunger 24.

In order to vary the suction eil'ect of plunget 13 upon the contents ofsupply ipe 18, an adjustable stop mechanism need; to be provided tovariably limit the inward stroke of the compensating plunger 24, and forthis purpose I secure to plunger 24, at 32, a lever 33 which is providedat its outer end ge an adjustable stop 35, sai stop bem adjustablymounted in an arm 36 carried by a bracket- 37. Lever 33 is provided withan intermediate slot 38 into which is projected a pivot pin 39 carriedby an arm 40. Pin 39 is also projected into a slot 41 formed in bracket37, said slot lying at an angle which is substantiall coincident withthe an ular osition of ever 33 and its slot 38 w en \ston 24 is in itsoutermost position so that, in this position there may be a, shifting ofpin 39 without producin any swinging movement of the lever 33. no 40 iscarried by an eccentric strap 43 mounted upon an eccentric 44 carried bya rock shaft 45, which may be rocked by suitable connections 46 with aspeed controlled governor 47.

lVith the parts adjusted as shown in the drawing the operation is asfollows :V\'ith the displacing plunger 13 at the end of its out-ward, orsuction, stroke, compensating plunger 24 has been driven inward by thepressure within chamber 27 until roller 34 engages head 35 and as thismovement of plunger 24 has been (to-extensive, in displacemrnt volume,with the withdrawal of plunger 13, there will have been no flow ofmaterial from supply pi e 18 into chamber 11 and consequently, wicnplunger 13 is projected into the pump chamber ll,plunger 24 will bedriven out of the chamber 11. by the pressure exerted by plunger 13,lllllll the end of plunger 2 engages stop 31 which will not be untilplunger 13 has reached the inner end of its stroke. Consequently therewill be no discharge through pipe 21. Durlog all of this time the onlyprrssurc. bryoml the more weight of lever 33, upon pivot ill], wasduring the time when whorl ill was in rngugvun-nt with stop 35 andamounted to not more than twice the total prcssuw exerted in am theinner and of plunger 2 which, 0 course. m't'd not be great. lly shillingpin 31) to the left, roller ill will he and thus pl'm'cfll Ill!) l'llfurther inward movement of plunger 24, be-

fore plunger 13 has finished its outward i of stroke. Consequently aquantity of li aid will be drawn into the map, more or ess dependingupon the di erences in volume movement of the two plungers and, upon thereturn or inward stroke of the displacing plun er 13. plunger 24 will bedriven outwar ly to its stop before plunger 13 will have finished itsinward stroke and there will be a consequent discharge of liquid fromthe pump. It will be noticed that, by this arrangement, no definiteproportion be tween the displacement volume of the two plungers l3 and24 need be rovided becapse the inward movement of t e compensatingplunger is a yielding movement Wl'llCl merely follows the outwardmovement of the plunger 13 and therefore can at no time exceed, involume, the volume withdrawal of the plunger 13. On the return or inwardstroke of lunger 13 the compensating plunger 24 is forced outward]volume for volume, by the plunger 13, until the positive sto 31 isreached.

y this construction, it will be apparent, that I have succeeded inavoiding it did:- cult which has heretofore existed in pumps of thisgeneral type where, because of a positive connection between thedisplacing plunger and compensating plunger, very great care had to beexercised in accurately proportioning the two plungers.

I claim as my invention:

1. The combination with a pump chamber, of a displacing plungerprojectable into and out of t :e pump chamber, a compensating plungerprojectable into and out of the pump chamber, a stop arranged to limitthe outward movement of the compensating plunger, means, independent ofthe displacmg plunger, for driving the compensating plun r inwardly,stop mechanism associate with the compensating plunger for limiting theinward movement thereof, and means by which said last mentioned stopmechanism may be adjusted to variably limit the inward movement of thecompensating plunger.

2. The combination with a pump chamber having inlet and outlet valves,of a displacing plunger projectable into and out of the pump chamber, acompensating plunger Emjectuble into and out of the pump chamer, a stoparranged to limit the outward movement of the compensating plunger,means, independent of the displacing plunger, for driving thecompensating plunger inwardly, stop mechanism associntcd with thecompensating plunger for limiting the inward movement thereof, and meansby which said last mcntioncd stop mechanism may be adjusted to variablylimit. the inward movement of the compensating plunger.

3. The combination with a pump chamber I a displacing plunger projectabe into and 5 out of the am chamber, a compensating plun er pro ecta 1einto and out of the pump cham a stop arranged to limit the outwardmovement of the compensating plun er, means, inde ndent of the displacmgplunger, for yicl ingly driving the compensatmg plunger nwardly, stopmechan- 13m associated with the compensating plunger for limitin theinward movement thereof, and means y which said last mentioned stopmechanism may be adjusted to variably limit the inward movement of thecompensating plunger.

4. The combination with a pump chamher having inlet and outlet valves,of a displacing plunger projectable into and out of the pump chamber, acompensating plunger projectable into and out o the pump chamber, a stoparranged to limit the outward movement of the compensating plunger,means, inde endent of the displacing plunger, for ye dingly driving thecompensatmg plunger inwardly, stop mechanism associnted with thecompensating plunger for limiting the inward movement thereof, and meansby which said last mentioned stop mechanism may be adjusted to variablylimit the inward movement of the compensating plunger.

3. in a pump, the combination with a pump chamber, of a displacinplunger projectable into and out of said amber, a compensating plungerprojectahle into and out of the chamber, means, independent of thedisplacing plunger, for driving the compensatmg plunger inwardly, a stopfor uniformly limiting the outward movement. of the. compensatingplunger, a lever connected at one end to t e compensat' plunger, a stoparranged to enga e said ever, a crum for said lever, an means forshifting said fulcrum relative to the lever to vary the relation betweensaid lever andits stop. 110

(S. In a ump, the combination with a pum cham r, of a displacm plungerproecta le into and out of said c iamber,a compensatin plungerprojectuble into and out of the c lumber, means, independent of the 115displacing plunger, for yiel ingl driving the com ensating plungerinward y a stop for uni ormly limiting the outward move ment of thecompensating plunger, a lever connected at one end to the compensating120 plunger, a stop arranged to engage said le var. a fulcrum for saidlever, and means for shifting said fulcrum relative to the lever to varythe relation between said lever and ils stop.

7. In a amp, the combination with a pmn chum )c1', of a displucm plungerprocctn tie into and out of said c iamberm compausutin plungerprojectahlc into and out of tho ciambcr, means, independent of the 130displacin plunger, for driving the compen satm p inwardly, a stop formuform y limiting the outward movement oi the compensati plunger, alever connected at one end to t e compensati plunger, a stop arranged toengag said ever, a fulcrum for said lever, an means for shifting saidfulcrum to vary the relation between the lever and its stop.

8. Inha ump,f thg ciimbinatilon with a um c am r,o aispacmgpungerproiiecta iile into and out of said chamber, a compensatinplunger projectable into and out of the amber, means, independent of thedisplacing plunger, for yieldmgly'dnw ing the compensating plungerinwardly, a stop for uniformly limiting the outward movement of thecompensating plunger, a lever connected at one end to the compensatingplan 1, a sto arranged to engage said lever a crum or said lever, andmeans for shifting said fulcrum to vary the relation between the leverand its stop.

9. Inl a ump,f tha ctlimbinatilon with a um clam r,o a 18 ac ungerproiecta le into and out of aid t zfia inbena compensatingdplunger alsoprojectable into and out of sax chamber, a prmrtzplunger and itspressure chamber associa with said compensating plungler to yieliilfiglydrive said compensating p unger mw y, a. stop for uniformly limiting theoutward movement of the compensating plunger, and means associated withthe compcnsatgig plunger for variably limiting its inw movement.

10. In a ump the combination with a pum chum r, of a displacm plungerproecta is into and out of said c amber, a comisatin lun er alsoproject/able into and ii t of said chaiiiber, a presspre lunger and itspressure chamber associa with said compensating plunger to yleldlfilydrive said compensating plunger inwa y a stop for uniformly limitin theoutwa movement of the compensa ingdplunger, a lever connected at one endwith e compensatin member, a stop arranged in the path 0 movement ofsaid lever to limit the inward movement of the compensating plunger, afulcrum for said lever and means for shifting said fulcrum to vary therelation be tween said lever and its stop.

11. In a pump, the combination with a pum chamber, of a displacingplunger proecta le into and out of said chamber, a com pensating plungeralso projeetable into and out of said chamber, a pressure lunger and itspressure chamber associat with said compensating plunger to yieldirsglydrive said compensating plunger lnwar y a stop for uniformly limitingthe outw movement of the compensating lunger, a lever connected at oneend with t e compensatin member, a stop arranged in the path 0 movementoff said lever to limit thle inward movement 0 t e compensating p u r, afulcrum for said lever, and means foi s hi ing said fulcrum relative tothe lever to vary the relation between said lever and its stop.

In witness whereof I have hereunto set my hand and seal at lndianapolis,Indiana, this second day of Au st, A. D. one thousand nine hundred annine.

NORMAN MoCARTY. [1,. s.)

Witnesses:

Aimma M. H000, Tnomas W. McMmms.

